Electrical switch for mechanical signals



P. H. WOLFAARDT.

ELECTRICAL SWITCH FOR'MECHANICAL SIGNALS. APPLICATION FILED NOV. II, 1920; RENEWED FEB. 2B. |922.

1,41 3 ,249. AvPz'oented Apr. 18, 1922.

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111 lll/11 2O Mj/aan/ I A INVENTOR.

To 'all whom t may concern:

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' PIETER EENDRIK,WO'LFeeePTLLGr @waartoe Yremisveel@ ,SUT'H Arme A' nnncrnicnnfswircrr non iancrrarircnn sreivars.

Y l l Specification of'Lett'ers Eratent. l Patientedlhpli 18, 1922. originar application 'mea April a7, i920, serial 1ra-286,056.

'bei 11, 1920, sex-iai No'. 423,404. "Renewed February as, 19522." serialno."'539,a11.V

' Be it known` that I, PIETER H. WOL-marina?, a subject of the AKing of England, residing at Bloemhof, Transvaal, South `Africa, Ahave r invented certain newV andfuseful Improvements in Electricalk Switches for Mechanical cation, reference beinghad therein tothe accompanying drawings. y

This invention relates to an electrical switch for a mechanical signal, andthis application is a divisional case from the original application, Serial No. 286,056, upon whichUnited States Patent No. .1,338,114

`issued April 27, 1920, and entitled Signal for motor vehicles.

The object of the inventionis the construction of a simple and .efficient switch device for closing a circuit at lpre-determined times in a mechanical signal apparatus.

YWith this and other objects in view, my

invention comprises certain novel combinations, constructions and arrangements of parts as .will be hereinafter described,illus trated in the accompanying drawings, and more particularly pointed out in the `appended claims. Y Y

In they drawings:

Figure 1 is a vertical sectional view of a device constructed in accordance with the present invention. f

Figure 2 is a bottom plan view of the arm-y carrying head, showing the primary contact ring and the auxiliary contact plates attached thereto. A Figure 3 is a vertical sectional view of one of the Contact devices. 5 V y As explained in my United States Patent No. 1,338,114, thev casing 1 is provided, inV

which is a verticalk shaft 2, tothe upper end of which shaft is attached the arm-carrying head 3'. On asuitable support 4, in the casing 1, are the primary contact device 5 and the `auxiliary contact device 6 v these contact devicesare duplicates in structure, and will be, hereinafter, specifically described.

The arm-carrying head is provided with a 'plurality of angle plates 7, fastened to the side and bottom of the head 3 by screws 8; these angle plates Z constitute auxiliary contacts; it is to be understood that the head Y 3 is formed of nonconducting material, so

that if vthe auxiliarycontact device 6 is bearing against a portion of the head 3, be

' tween `twocontiguous auxiliary' contacts, or

plates r, the circuit will be open;

lfheV primary contact vplate or ring) is i fastened, by "screws `10, in horizontal .bifur- *catedfporti'oiisf 11 of the angle plates oraux# V p @ihary'contacts a Y Signals,-ofwhich thefollowing 1s a specifi-- l'F/achcont'aot device (Fig. 3) comprisesa` A Divided matins application ined N'oven-l body 12resting upon the support 4, ,andV the` f body-.has an aperture 13, through which a Y screw orother ordinary. deyicemay extend" into the support V4, for holding the body uponI the support. A vertical pocket 14 is formed l'in the body 12, at its` outer end, and they I lower end of the pocket is closed by a 'thread.;

ed member 15. A casing 16, having a closed,

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upper, vrounded Vend is slidably mounted in the upper end of the pocket 14, and a coil spring 17 ispositioned 'in the casing and presses,at its lower end, gainst the threaded Y' member 15, whereby the rounded, upper end of casing 16 is held in engagement, at all times, withthe ringVV 9, in the case of the priL mary contact device, andin Vthe case of the auxiliary contact device," the upper end fof the casing 16 .is held either against the bottom face of the head 3, or the angle plates, or auxiliary contacts. a f

Wires 18 areplaced, atvtheir inner ends,

into the bodies 12 Fig.; 3) and set-screws 19v retain thesewires'( ea'ding to signals, alarms, Y'

or indicators) VKsecurely fastened tothe bodies 12.

.It will be understoodthat thecircuit'is completed through the primary and auX- iliaryccontact devices, ring 9 and auxiliary contact 7; when the casing 16, of the auX- ihary contact dev1ce.6, is Ypressing directly `against the head 3, the circuit will be broken, but as soon as the casing 16 engages one of thecontact devices 7, ,then the circuit' will be complete Athrough the contact.device,the lringf and the contact devices, towhich are connected wires 18, leading to a signal of any desired type. l

While I have described the preferred emV` bodiment of my invention, and havegillustrated the same in the ,accompanying drawings, certain minorV changes lorv alterations may appear to one skilled in the art to which this invention relates, during' the extensive manufactureof Vthe same and I, therefore, reserve the right to make such alterations or changes as shalljfairly fall within theg Vscope ofthe appended claims l/Vhat l claim is:

l. In a device of the class described, thc combination With a casing, of' a support in said casing, a shaft Vin said casing, a head carried by said shafta primary and an aux* iliary Contact device carried by said support, said head being formed of insulating matcrial and provided-With a ring contacting at all times with the primary contact device, and auxiliary contacting' means on said head and contacting with the auxiliary contact device for closing a circuit through the contact devices, ring and the auxiliary contacting means.

2. In a deviceV of the class described, the combination with a casing, cfa support resting upon the bottom of said casing,a vertical shaft in said casing, an arm-carrying head secured to the shaft near its upper end, i

angle contact plates secured to the side and bottom of said head, said plates constituting auxiliary contacts, each plate provided with Va horizontal, bifurcatedportion, a plate or ring in the bi'urcated portions of all oli' said plates, means fastening said ring in said bifurcated portions, a primary and an auxiliary Contact device carried by said support,

In testimony whereof I hereunto affix my signature.

. METER n n-anali; woLrAARnr. 

